As clients can outgrow freelancers, freelancers as well can outgrow their clients. That's why it is better for the freelancers need to be looking for some indicators to know when the clients outgrow you. When they start pricing you less. When they are not willing to pay yiur stated amount even when you gave them the best price. Most of them will not even dialogue with you, they just leave you the moment you don't agree with them.